Primary purpose :
Compare the sensitivity of several thromboplastin reagents of various origins to prothrombin time and factor II, V, VII and X assays in two different populations of patients :
* Patients with an isolated extrinsic pathway deficiency (acquired or congenital) of factor II or V or VII or X. * Patients with an hepatocellular insufficiency generally associated with coagulopathy (with an intensity proportional to the degree of hepatic impairment).
Results of this work should improve knowledge of sensitivity of the screening test represented by the prothrombin time, depending on the origin of thromboplastin reagent used, in relation with coagulopathies mentioned above, as well as the performance of factors II, V, VII, X assays. This work would help to choice of the most suitable reagent for the needs of each hemostasis laboratory/center.
Plasma samples from patients addressed to the laboratory of the Strasbourg University Hospital (Strasbourg France) collected and anonymized after completion of the routine testing.
Patient with an isolated or combined extrinsic pathway factor deficiency (factor II, V, VII, X).
Patient treated with an oral anticoagulant treatment.
Patient treated with a parenteral anticoagulant treatment (apart from therapeutic dosages of unfractionated heparin and low molecular weight heparin).
Parallel
Prothrombin time
Biological/VaccineComparison of prothrombin time results obtained with the different thromboplastins reagent for subgroup (extrinsic pathway factor and for those with hepatocellular insufficiency) by a regression line and a Bland-Altman representation. Comparison of extrinsic pathway factor assays obtained with the different thromboplastins reagent for each subgroup by a regression line and a Bland-Altman representation. Evaluation and determination of the sensitivity of the prothrombin time according to the activity rate obtained for each factor (for each reagent).
Comparison of the sensitivity of several thromboplastin reagents of different origins (animal, human synthetic recombinant and human placental extraction) on prothrombin time and factor II, V, VII and X assays.
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